Semiconductors and Superconductors
Physics ⇒ Modern Physics
Semiconductors and Superconductors starts at 11 and continues till grade 12.
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A sample of silicon is doped with phosphorus. What type of semiconductor is formed?
A semiconductor has an equal number of electrons and holes. Is it intrinsic or extrinsic?
A student measures the resistance of a material as a function of temperature and finds that it drops to zero at 7 K. What can be concluded about the material?
A superconductor is cooled below its critical temperature in the presence of a magnetic field. What happens to the magnetic field inside the superconductor?
Calculate the number of holes created when one atom of boron is added to pure silicon.
Calculate the number of valence electrons in a silicon atom.
Describe the role of Cooper pairs in superconductivity.
Describe what happens to the resistance of a superconductor as it is cooled below its critical temperature.
A student measures the resistance of a material as a function of temperature and finds that it drops to zero at 7 K. What can be concluded about the material?
Which of the following best describes the energy band structure of a semiconductor?
(1) Overlapping valence and conduction bands
(2) A small energy gap between valence and conduction bands
(3) A very large energy gap
(4) No energy gap at all
Which of the following elements is commonly used to dope silicon to create a p-type semiconductor?
(1) Phosphorus
(2) Boron
(3) Arsenic
(4) Antimony
Which of the following is a high-temperature superconductor?
(1) Lead
(2) Yttrium barium copper oxide (YBCO)
(3) Mercury
(4) Tin
Which of the following is a property of intrinsic semiconductors?
(1) They are pure semiconductors without any significant dopant atoms.
(2) They have a large number of free electrons at room temperature.
(3) They are always metals.
(4) They do not conduct electricity at all.
A p-n junction is formed by joining ______ and ______ semiconductors together.
If the band gap of a material is 0 eV, the material is a ______.
The energy gap between the valence band and conduction band in a typical semiconductor is about ______ eV.
The process of adding impurities to a semiconductor to change its electrical properties is called ______.
State whether the following statement is true or false: Superconductors can carry current without any energy loss.
True or False: At absolute zero, an intrinsic semiconductor behaves like an insulator.
True or False: In a p-type semiconductor, holes are the majority charge carriers.
